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Which body systems protects the body against foreign substances?
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3 votes
Which body systems protects the body against foreign substances?

User Czaku
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5 votes
The immune system and maybe the respiratory system since it has the cilia and mucus to trap and push away dust and foreign cells
User Andrey Tserkus
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2 votes
Your immune system and I guess your skin because the skin acts as a barrier do stuff does not get in but if it does your immune system attacks it
User Darlyne
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